You can invest in any project directly on its website, but you need to have a wallet with bitcoins, ether or other cryptocurrency, as well as be able to carry out transactions. You can get a wallet, for example, here — then everything works like with any transfer system or Internet Bank.
Information resources on which you can find projects that conduct ICO, a lot — already mentioned Smith & Crown, ICO Alert and others.
AngelList and Protocol Labs have recently decided to launch a new platform Coinlist — a specialized platform for launching ICO, for which they, in particular, are working on the contract base (and, of course, it will immediately carry out the screening of projects) — it is not clear who will be able to invest through it, but for the inexperienced investor it will definitely be a more friendly solution.
